I think maybe Obito was just planning all along to take the power of the 10 tails after Madara died, and use it to create a new world where Rin was alive and in peace with Kakashi. If he just wanted to kill Kakashi, he's had many chances to do so. Revenge isn't his goal. Obito was obviously a good kid, and as he reminded us "Tobi is a good boy". I think even after losing himself to the corruption of Madara, he was still himself and always planning a way to thwart Madara and to stop his plan. When Kabuto showed up with Madara's corpse, it created a problem.
This means he had to once more act the villain, and to stop Madara while playing along. I think Obito has been planning to turn on Madara for awhile now. Going to guess he will try to teleport Madara into himself or use some sealing jutsu to end his own life and take Madara into his eye.
This means he had to once more act the villain, and to stop Madara while playing along. I think Obito has been planning to turn on Madara for awhile now. Going to guess he will try to teleport Madara into himself or use some sealing jutsu to end his own life and take Madara into his eye.